For climate change, CH4 is the major contributor for the two
scenarios (Table 4). As for the previous impacts, in the transfer
scenario, on-farm storage contributes most; while in the treatment
scenario, the storage and treatment phases contribute to the same
extent. CO2 is mainly emitted during transport of slurry and
compost and N2O is mainly emitted during and after the application
of slurry, for the transfer scenario, and of compost, for the
treatment scenario.